const startButton = document.getElementsByClassName('play')[0]
const intro = document.getElementsByTagName('main')[0]
const scoreDiv = document.getElementsByClassName('score')[0]

const resolutionWidth = screen.width
const resolutionHeight = screen.availHeight + 23 // screen doesn't actually start at 0;

var firstObstacleWindow
var secondObstacleWindow
var flappyWindow
let flappyInitialPosition
let base
let currentScore = 0

window.onload = () => {
  const isMobile = checkDevice()

  if (isMobile) {
    const mobileMessage = document.getElementById('mobile-message')
    mobileMessage.className += ' mobile'
    intro.style.display = 'none'
  }

  flappyInitialPosition = resolutionHeight - (resolutionHeight / 2)

  if (window.name === '') {
    base = window

    startButton.onclick = () => {
      firstObstacleWindow = window.open('./firstObstacle/firstObstacle.html', 'firstObstacleWindow', 'menubar=no,location=no,status=1,scrollbars=no,width=100,height=400,screenX=700,screenY=0')
      secondObstacleWindow = window.open('./secondObstacle/secondObstacle.html', 'secondObstacleWindow', `menubar=no,location=no,status=1,scrollbars=no,width=100,height=200,screenX=${resolutionWidth - 100},screenY=${resolutionHeight - 150}`)
      flappyWindow = window.open('./flappy/index.html', 'flappyWindow', `menubar=no,location=no,status=1,scrollbars=no,width=10,height=100,screenX=10,screenY=${flappyInitialPosition}`)

      startGame()
    }
  } else {
    base = window.opener
    flappyWindow = base.flappyWindow
    firstObstacleWindow = base.firstObstacleWindow
    secondObstacleWindow = base.secondObstacleWindow
  }

  window.addEventListener('keydown', e => {
    switch (e.keyCode) {
      case 81: // q
        quit()
        break
      case 32: // space
        upFlappy()
        break
      case 82: // r
        restartGame()
      default:
        break
    }
  })
}

const quit = () => {
  flappyWindow && flappyWindow.close()
  firstObstacleWindow && firstObstacleWindow.close()
  secondObstacleWindow && secondObstacleWindow.close()

  base.document.getElementsByTagName('main')[0].style.display = 'block'
  base.document.getElementsByClassName('score')[0].style.display = 'none'
}

const upFlappy = () => {
  flappyWindow.moveBy(0, -70)
  flappyWindow.document.getElementsByClassName('jump')[0].play()
}

const moveFlappy = () => {
  flappyWindow.moveBy(0, 3)
  checkForCollision()
  calculateScore()
}

const startGame = () => {
  hideIntro()
  flappyWindow.lost = false
  moveObstacle()
}

const hideIntro = () => {
  intro.style.display = 'none'
  scoreDiv.style.display = 'block'
}

const restartGame = () => {
  if (flappyWindow.lost) {
    flappyWindow.moveTo(10, flappyInitialPosition)
    firstObstacleWindow.moveTo(700, 0)
    secondObstacleWindow.moveTo(resolutionWidth - 100, resolutionHeight - 150)
    flappyWindow.lost = false
    displayScore(0)
    window.requestAnimationFrame(moveObstacle)
  }
}

const getRandomWindowHeight = (min, max) => {
  min = Math.ceil(min)
  max = Math.floor(max)
  return Math.floor(Math.random() * (max - min) + min)
}

const moveObstacle = () => {
  (!flappyWindow.lost) ? window.requestAnimationFrame(moveObstacle) : window.cancelAnimationFrame(moveObstacle)

  moveFlappy()
  const windows = [firstObstacleWindow, secondObstacleWindow]

  const maxHeight = resolutionHeight - 100 - 100 - 50 // height of flappy, minimum height of obstacle, extra space;
  const minHeight = 100

  windows.forEach(singleWindow => {
    let currentXPosition = singleWindow.screenX
    const currentYPosition = singleWindow.screenY

    if (currentXPosition > 0) {
      if (singleWindow.name === 'secondObstacleWindow') {
        singleWindow.moveTo(currentXPosition -= 3, currentYPosition)
      } else if (singleWindow.name === 'firstObstacleWindow') {
        singleWindow.moveTo(currentXPosition -= 3, 0)
      }
    } else {
      singleWindow.resizeTo(100, getRandomWindowHeight(minHeight, maxHeight))

      if (singleWindow.name === 'secondObstacleWindow') {
        const currentYPosition = resolutionHeight
        singleWindow.moveTo(resolutionWidth, currentYPosition)
      } else if (singleWindow.name === 'firstObstacleWindow') {
        singleWindow.moveTo(resolutionWidth, 0)
      }
    }
  })
}

const checkForCollision = () => {
  const flappyWindowBottom = flappyWindow.screenY + flappyWindow.outerHeight
  const flappyWindowRight = flappyWindow.screenX + flappyWindow.outerWidth
  const firstObstacleWindowBottom = firstObstacleWindow.screenY + firstObstacleWindow.outerHeight
  const firstObstacleWindowLeft = firstObstacleWindow.screenX
  const secondObstacleWindowLeft = secondObstacleWindow.screenX
  const secondObstacleWindowTop = secondObstacleWindow.screenY

  if (flappyWindowBottom >= resolutionHeight) {
    flappyWindow.lost = true
    flappyWindow.document.getElementsByClassName('die')[0].play()
  }

  if (flappyWindow.screenY <= firstObstacleWindowBottom && firstObstacleWindowLeft <= flappyWindowRight) {
    flappyWindow.lost = true
    flappyWindow.document.getElementsByClassName('hit')[0].play()
  }

  if (flappyWindowBottom >= secondObstacleWindowTop && flappyWindowRight >= secondObstacleWindowLeft) {
    flappyWindow.lost = true
    flappyWindow.document.getElementsByClassName('hit')[0].play()
  }
}

const calculateScore = () => {
  const firstObstacleWindowLeft = firstObstacleWindow.screenX
  const secondObstacleWindowLeft = secondObstacleWindow.screenX

  if (firstObstacleWindowLeft <= 0 && !flappyWindow.lost || secondObstacleWindowLeft <= 0 && !flappyWindow.lost) {
    currentScore += 1
    displayScore(currentScore)
  }
}

const displayScore = score => {
  if (scoreDiv) {
    scoreDiv.innerHTML = score
  } else {
    base.document.getElementsByClassName('score')[0].innerHTML = score
  }
}

const checkDevice = () => {
  let check = false;
  (function(a) { if (/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows ce|xda|xiino|android|ipad|playbook|silk/i.test(a) || /1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test(a.substr(0, 4)))check = true })(navigator.userAgent || navigator.vendor || window.opera)
  return check
}
